I do believe that your reading level and comprehension are what is going to govern what you read. I read adult books from about age 8,, simply ignored what I did not understand. I used to drive teachers nuts because I knew all these words and what they meant, but not how to pronounce them.. One teacher complained to my Mom and she said... She can always find out how to pronounce.. Just leave her alone.. To this day, I think you read and take in in different ways. I first read Animal Farm at 12.. Thought of it as an animal story about how cruel some animals could be.. Then at 15 about how is pertained to life and then at 25 about what it truly meant on severel levels..Think about things you have read over the years and how the meanings have changed.